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Years ago I made a replacement washer fluid bottle that had a tube through it as a heat exchanger. I diverted the heater water through that tube so the bottle contents were heated and I cleared the screen with hot water. It worked, sort of, but even hot water on the screen freezes quickly in very cold conditions. I have not bothered repeating this on later cars.
One thing I was worried about was the windscreen glass cracking when I sprayed hot water on it in cold weather, but that never happened.
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